A: The core challenge requires only the free base game. However, the Business Expansion (paid DLC) is needed if you want to buy and run your own pizzeria at the end. The Crime Expansion (another paid DLC) adds more detailed criminal options but is not strictly necessary.
The term became popular largely through YouTubers and streamers (like SSundee, CinnamonToastKen, and others) who created challenge videos titled something like "I Survived the Pizza Edition in BitLife." the pizza edition bitlife
A: No official BitLife achievement. But it's a popular community-driven "personal achievement." A: The core challenge requires only the free base game